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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=dQ72a2aFqXjeEXN3RbonOindW65HTj9dwtGUo7LrPlc=; b=PgjKaQC5jiyHQq9HS6AfIvn/GZA0B6mSv2StIt0rYPTR7rI2OcKsVBCiFF4AkfTM67 I0SjP0HefPi4m11Ot9AQeA++LMMXiDB290u0NmwKctpJibkIQ8rEtfnYguvSpHTelaDT XoC0rYyACyFTIlEwxgvrkFVAMosjiEw0vUVYmPsgldCaN3u4Ru8pkOGDdgwNPNGTNDfc yy60ZivZp9AyrAWgfOyWb8m7I1utrwdx3kGjTzcWisWevH2YlUmSSxyBseeN2n0frZAo QW6bjG53YNNYc0tYbv9DqfCpGWIdkWDr3h2HwRMqGfiEXgIdurFXxP5PXPg+qvk1pvQU XkOw== X-Gm-Message-State: AOAM531a1g9TdrRgoWiVdwnqs8qkLwN+6Pc7LVd0ABBurolgyejKBxN2 mZaa2u+/PD6UhLl/ip69Nd+NH499FGc= X-Google-Smtp-Source: ABdhPJwofzreVetARtWimMPboicC9nrbPS0u8RG85pPN1AGkZQzG7AGBsgVSJ76BcwyMwPK5rLByKZJ7Zz4= X-Received: from oupton.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:404]) (user=oupton job=sendgmr) by 2002:a05:6902:1003:: with SMTP id w3mr8707000ybt.487.1627579991987; Thu, 29 Jul 2021 10:33:11 -0700 (PDT) Date: Thu, 29 Jul 2021 17:32:55 +0000 In-Reply-To: <20210729173300.181775-1-oupton@google.com> Message-Id: <20210729173300.181775-9-oupton@google.com> Mime-Version: 1.0 References: <20210729173300.181775-1-oupton@google.com> X-Mailer: git-send-email 2.32.0.432.gabb21c7263-goog Subject: [PATCH v5 08/13] selftests: KVM: Introduce system counter offset test From: Oliver Upton To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: Paolo Bonzini , Sean Christopherson , Marc Zyngier , Peter Shier , Jim Mattson , David Matlack , Ricardo Koller , Jing Zhang , Raghavendra Rao Anata , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, Andrew Jones , Oliver Upton X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210729_103313_891339_FF04CE2B X-CRM114-Status: GOOD ( 17.51 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Introduce a KVM selftest to verify that userspace manipulation of the TSC (via the new vCPU attribute) results in the correct behavior within the guest. Reviewed-by: Andrew Jones Signed-off-by: Oliver Upton --- tools/testing/selftests/kvm/.gitignore | 1 + tools/testing/selftests/kvm/Makefile | 1 + .../kvm/system_counter_offset_test.c | 132 ++++++++++++++++++ 3 files changed, 134 insertions(+) create mode 100644 tools/testing/selftests/kvm/system_counter_offset_test.c diff --git a/tools/testing/selftests/kvm/.gitignore b/tools/testing/selftests/kvm/.gitignore index 958a809c8de4..3d2585f0bffc 100644 --- a/tools/testing/selftests/kvm/.gitignore +++ b/tools/testing/selftests/kvm/.gitignore @@ -52,3 +52,4 @@ /set_memory_region_test /steal_time /kvm_binary_stats_test +/system_counter_offset_test diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile index 0f94b18b33ce..9f7060c02668 100644 --- a/tools/testing/selftests/kvm/Makefile +++ b/tools/testing/selftests/kvm/Makefile @@ -85,6 +85,7 @@ TEST_GEN_PROGS_x86_64 += memslot_perf_test TEST_GEN_PROGS_x86_64 += set_memory_region_test TEST_GEN_PROGS_x86_64 += steal_time TEST_GEN_PROGS_x86_64 += kvm_binary_stats_test +TEST_GEN_PROGS_x86_64 += system_counter_offset_test TEST_GEN_PROGS_aarch64 += aarch64/debug-exceptions TEST_GEN_PROGS_aarch64 += aarch64/get-reg-list diff --git a/tools/testing/selftests/kvm/system_counter_offset_test.c b/tools/testing/selftests/kvm/system_counter_offset_test.c new file mode 100644 index 000000000000..b337bbbfa41f --- /dev/null +++ b/tools/testing/selftests/kvm/system_counter_offset_test.c @@ -0,0 +1,132 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2021, Google LLC. + * + * Tests for adjusting the system counter from userspace + */ +#include +#include +#include +#include +#include + +#include "test_util.h" +#include "kvm_util.h" +#include "processor.h" + +#define VCPU_ID 0 + +#ifdef __x86_64__ + +struct test_case { + uint64_t tsc_offset; +}; + +static struct test_case test_cases[] = { + { 0 }, + { 180 * NSEC_PER_SEC }, + { -180 * NSEC_PER_SEC }, +}; + +static void check_preconditions(struct kvm_vm *vm) +{ + if (!_vcpu_has_device_attr(vm, VCPU_ID, KVM_VCPU_TSC_CTRL, KVM_VCPU_TSC_OFFSET)) + return; + + print_skip("KVM_VCPU_TSC_OFFSET not supported; skipping test"); + exit(KSFT_SKIP); +} + +static void setup_system_counter(struct kvm_vm *vm, struct test_case *test) +{ + vcpu_access_device_attr(vm, VCPU_ID, KVM_VCPU_TSC_CTRL, + KVM_VCPU_TSC_OFFSET, &test->tsc_offset, true); +} + +static uint64_t guest_read_system_counter(struct test_case *test) +{ + return rdtsc(); +} + +static uint64_t host_read_guest_system_counter(struct test_case *test) +{ + return rdtsc() + test->tsc_offset; +} + +#else /* __x86_64__ */ + +#error test not implemented for this architecture! + +#endif + +#define GUEST_SYNC_CLOCK(__stage, __val) \ + GUEST_SYNC_ARGS(__stage, __val, 0, 0, 0) + +static void guest_main(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(test_cases); i++) { + struct test_case *test = &test_cases[i]; + + GUEST_SYNC_CLOCK(i, guest_read_system_counter(test)); + } +} + +static void handle_sync(struct ucall *uc, uint64_t start, uint64_t end) +{ + uint64_t obs = uc->args[2]; + + TEST_ASSERT(start <= obs && obs <= end, + "unexpected system counter value: %"PRIu64" expected range: [%"PRIu64", %"PRIu64"]", + obs, start, end); + + pr_info("system counter value: %"PRIu64" expected range [%"PRIu64", %"PRIu64"]\n", + obs, start, end); +} + +static void handle_abort(struct ucall *uc) +{ + TEST_FAIL("%s at %s:%ld", (const char *)uc->args[0], + __FILE__, uc->args[1]); +} + +static void enter_guest(struct kvm_vm *vm) +{ + uint64_t start, end; + struct ucall uc; + int i; + + for (i = 0; i < ARRAY_SIZE(test_cases); i++) { + struct test_case *test = &test_cases[i]; + + setup_system_counter(vm, test); + start = host_read_guest_system_counter(test); + vcpu_run(vm, VCPU_ID); + end = host_read_guest_system_counter(test); + + switch (get_ucall(vm, VCPU_ID, &uc)) { + case UCALL_SYNC: + handle_sync(&uc, start, end); + break; + case UCALL_ABORT: + handle_abort(&uc); + return; + default: + TEST_ASSERT(0, "unhandled ucall %ld\n", + get_ucall(vm, VCPU_ID, &uc)); + } + } +} + +int main(void) +{ + struct kvm_vm *vm; + + vm = vm_create_default(VCPU_ID, 0, guest_main); + check_preconditions(vm); + ucall_init(vm, NULL); + + enter_guest(vm); + kvm_vm_free(vm); +}